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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a958faa2b976b56ff089d41adc46cae6751a57c3bd33ce0a180fd49b738b74c0' 
  AND token = '7GvbywHlPc0hyAs2fUeUL91JmPRgDJF5jdsLgyzXcyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}